The region considered in this paper is a small area lying to the south and southeast of Sioux Falls, South Dakota, and the problem is, the age of a drift-plain.
Proceedings of the Iowa Academy of Science
©1913 Iowa Academy of Science, Inc.
Carman, J. Ernest
"The Wisconsin Drift-Plain in the Region about Sioux Falls,"
Proceedings of the Iowa Academy of Science, 20(1), 236-250.
Available at: https://scholarworks.uni.edu/pias/vol20/iss1/25